Radio loud speaker



RADIO LOUD SPEAKER Filed March 22. 1928 INV NTOR M w, j, 1 A...

ATTORNEY Patented Nov. 24, 1931 .i UNITED STATES,

[O FICE AUBREY mxnmmvr, for new Yoitx, 1v. Y.

RADIOLOU'D SPEAKER Application filed March 22, n ers; is. 263,676.

which is directly acted uponbythe receiv-v 1ng magnets.

v The invention will be described'with ref erence to theaccompanying drawings, in \vl11ch- Figure 1 is a sectional elevation of an em-- bo'diment of the invention; 1 Figure 2 is an elevation, partly in section of the modified form of the device, and

Figure 3 is a front elevation of the 'primary vibratory cone of the structure illus tratediin the preceding figure. 1

In Figure 1 I haveillustrated at l the casing of a loud speaking unit having a chamber 2 to receive the magnet 3, the latter having pole pieces 1. Suit-ably supported in posit-ion to receive impulses from the pole pieces, as for example upon annular shoulder 5, is the metallic diaphragm 6.

superposed upon the diaphragm is a ring 7 having clamped therein by an inner ring 8 a drum 9 which may be of parchment, pig skin, light celluloid or other vibratory material. An air chamber 10 is preferably provided intermediate the drum and the diaphragm 6.

Secured upon drum 9 is a vibratory inner resonator l1 surrounded by a vibratory outer resonator 12. For convenience of attachment each resonator is formed with a flange 13 so bration of the diaphragm 6 and,due to the air chamber 10, the said vibrations are transmitted to the drum 9 and distributed to the resonators 11 and 12. The vibration of the smaller resonator offsets the overtones and discordant harmonics of the larger resonator. The inner and smaller resonator carries 5 the higher vibrations, or notes; while the outer and larger resonator carries the lower vibrations or notes.

In the-form of the invention illustrated in Figures-2 and-3, the unit 1" may beef the sameconstructionas thatillustratedin-Fig urejl'. Carried by a-casingl for vibration V by a drum, such as 9, or by anyother suitable memberj'which receives vibrations' 'fromf a magnet, is a conical resonator 1 1; This resonator is illustrated in detail in Figure 3.

It'is formed with a plurality of attaching points 15 for studs or rods 16 leading toa resonator preferably of like-construction, but of greater diameter, i i

' Casingl is 'carried bya'lrod 18 held by a standard 19, H Rod 18 supports: a; resonator 20 opposed'to resonator 17* and ofgreater diameter, receiving vibrations from resonator 17 through a plurality of connecting studs 21. Resonator 20 is in turn opposed to a resonator 22, the two being connected by a plurality of studs 23 through which the vibrations are transmitted. Rod 18 supports an innermost resonator 24 which is connected by studs 25 with resonator 22.

In the operation of the embodiment illustrated in Figures 2 and 3, the initial or pri-. mary resonator 14 transmits vibrations through studs 16 directly to opposed resonator 17, and through the connections above described the vibrations are from resonator 17 transmittedto resonator 20, thenceto resonator 22 and thence to resonator 24.

In either form of the device the small innerand primary resonator carries the higher vibrations, whereas the larger resonators carry the lower vibrations. The arrange ment of the resonators in mutual opposition offsets overtones and discordant harmonics eliminates reverberation and enables reproduetion of instruments, voices, etc. with a maximum fidelity. The invention enables great increase in volume without distortion. In the form of the invention illustrated'in Figures 2 and 3 the vibrations and sound waves are multiplied in an area very much smaller than is practicable with a singlecone or horn. As each vibration and sound wave acts upon the larger opposing resonator, it is magnified to the extent that such opposing resonator is larger than the cone or horn giving the initial impulse. In such form of the device the vibrations may be carried from one resonator to another by a central or apexconnecting rod or the like. Also, when studs or rods are used as the connecting devices, they may be placed at any desired points intermediate the centre of the resonators and their peripheries.

Having described my invention what I claim and desire to secure by Letters Patent is as follows 1. A vibratory loud speaker comprising a plurality of opposed resonators, means for vibrating one resonator and physical connections intermediate said resonator and the remaining resonators whereby the vibrations are mutually distributed, said means comprising a plurality of rods arranged about the outer margin of the opposed resonators.

2; A vibratory loud speaker comprising a vibratory element, a conical resonator having connections to the vibratory elementfor vibration thereby, a resonator carried by the first resonator and opposed thereto, a resonator carriedby the vibratory element support and connected with the last named resonator, the last two resonators having apexes in substantially the same axial line. j

- In testimony whereof, -I have signed my name to this specification. l

' AUBREY M. KENNEDY. 

